dc.creatorTeixeira, A. V.
dc.creatorGeissler, E.
dc.creatorLicinio, P.
dc.date2018-04-20T14:41:31Z
dc.date2018-04-20T14:41:31Z
dc.date2006-09-22
dc.date.accessioned2023-09-27T21:29:01Z
dc.date.available2023-09-27T21:29:01Z
dc.identifier1520-5207
dc.identifierhttps://pubs.acs.org/doi/abs/10.1021/jp064338c
dc.identifierhttp://www.locus.ufv.br/handle/123456789/18951
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8961381
dc.descriptionWe present dynamic light scattering (DLS) measurements of soft poly(methyl-methacrylate) (PMMA) and polyacrylamide (PA) polymer gels prepared with trapped bodies (latex spheres or magnetic nanoparticles). We show that the anomalous diffusivity of the trapped particles can be analyzed in terms of a fractal Gaussian network gel model for the entire time range probed by DLS technique. This model is a generalization of the Rouse model for linear chains extended for structures with power law network connectivity scaling, which includes both percolating and uniform bulk gel limits. For a dilute dispersion of strongly scattering particles trapped in a gel, the scattered electric field correlation function at small wavevector ideally probes self-diffusion of gel portions imprisoning the particles. Our results show that the time-dependent diffusion coefficients calculated from the correlation functions change from a free diffusion regime at short times to an anomalous subdiffusive regime at long times (increasingly arrested displacement). The characteristic time of transition between these regimes depends on scattering vector as ∼q-2, while the time decay power exponent tends to the value expected for a bulk network at small q. The diffusion curves for all scattering vectors and all samples were scaled to a single master curve.
dc.formatpdf
dc.formatapplication/pdf
dc.languageeng
dc.publisherThe Journal of Physical Chemistry B
dc.relationv. 111, n. 2, p. 340–344, dec. 2007
dc.rightsAmerican Chemical Society
dc.subjectDynamic scaling
dc.subjectPolymer gels
dc.subjectComprising nanoparticles
dc.titleDynamic scaling of polymer gels comprising nanoparticles
dc.typeArtigo


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